Injecting method of underground modifying and viscosity-reducing nano catalyst for thickened oil

A nano-catalyst and modification technology, applied in earth-moving drilling, production fluids, wellbore/well components, etc., can solve problems such as restricting application, affecting reservoir permeability, difficult to disperse uniformly, etc., to improve sweep efficiency, improve The effect of oil washing efficiency and improving contact efficiency

Active Publication Date: 2016-04-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the injection process, heterogeneous nanocatalysts will seriously affect the reservoir permeability due to adsorption, retention, clogging and other phenomena, and it is not easy to disperse evenly in crude oil after being transported to the reservoir, which restricts the application of this technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a method for injecting heavy oil underground upgrading and viscosity-reducing nano-catalysts, including the following steps:

[0032] (1) The nickel chloride of 0.65g and the urea of ​​0.3g are dissolved in 10g water respectively to obtain solution A1;

[0033] (2) Weigh 2.5g of di-octyl sodium sulfosuccinate and dissolve it in 50g of tetralin to prepare solution B1;

[0034] (3) mixing and stirring solution A1 and solution B1 to obtain a water-in-oil microemulsion;

[0035] (4) The above-mentioned water-in-oil microemulsion was used in a one-dimensional core physical simulation experiment. A sand-filled model with a length of 30 cm and an inner diameter of 2.54 cm was used in the experiment, and the porosity of the model core was 32%. At 90°C, the viscosity of saturated oil and dehydrated crude oil in the model is 2358mPa·s (50°C). After the model was cooled to 50°C (near the reservoir temperature), the water-in-oil microemulsion was complet...

Embodiment 2

[0039] This embodiment provides a method for injecting heavy oil underground upgrading and viscosity-reducing nano-catalysts, including the following steps:

[0040] (1) The cobalt chloride of 0.52g and the urea of ​​0.24g are dissolved in 10g water respectively to make solution A2;

[0041] (2) The Span60 that takes 3.5g is dissolved in the decahydronaphthalene of 50g and makes solution B2;

[0042] (3) mixing and stirring solution A2 and solution B2 to obtain a water-in-oil microemulsion;

[0043] (4) The above-mentioned water-in-oil microemulsion was used in a one-dimensional core physical simulation experiment. A sand-filled model with a length of 30 cm and an inner diameter of 2.54 cm was used in the experiment, and the porosity of the model core was 32%. At 90°C, the viscosity of saturated oil and dehydrated crude oil in the model is 7847mPa·s (50°C). After the model was cooled to 50°C (near the reservoir temperature), all the water-in-oil microemulsion was injected i...

Embodiment 3

[0047]This embodiment provides a method for injecting heavy oil underground upgrading and viscosity-reducing nano-catalysts, including the following steps:

[0048] (1) The copper chloride of 0.27g and the urea of ​​0.12g are dissolved in 10g water respectively to obtain solution A3;

[0049] (2) Weigh 4.2g of Span80 and dissolve it in 70g of cyclohexane to prepare solution B3;

[0050] (3) Mix and stir solution A3 and solution B3 to obtain a water-in-oil microemulsion;

[0051] (4) The above-mentioned water-in-oil microemulsion was used in a one-dimensional core physical simulation experiment. A sand-filled model with a length of 30 cm and an inner diameter of 2.54 cm was used in the experiment, and the porosity of the model core was 32%. At 90°C, the viscosity of saturated oil and dehydrated crude oil in the model is 27364mPa·s (50°C). After the model was cooled to 50°C (near the reservoir temperature), the water-in-oil microemulsion was completely injected into the model...

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Abstract

The invention provides an injecting method of an underground modifying and viscosity-reducing nano catalyst for thickened oil. The method is characterized in that the precursor micro-emulsion of the modifying and viscosity-reducing nano catalyst for the thickened oil is injected into a stratum first, the precursor micro-emulsion is water-in-oil type micro-emulsion, the precursor micro-emulsion can automatically enter oil phase and evenly dispersed after being injected into the stratum due to the fact that the the outer phase of the micro-emulsion is oleophylic hydrogen donor, nano reaction occurs when the temperature of inner phase rises to 160-200 DEG C, and no extra energy needs to be injected due to the fact that the decomposition temperature is lower than the modifying temperature of the thickened oil. Compared with a method directly injecting the nano catalyst, the injecting method has the advantages that the automatic oil finding function of the nano catalyst can be achieved, the problem that nano catalyst is easy in absorption and blocking during injection can be avoided, effective injecting of the nano catalyst is achieved, and the modification and viscosity reduction of crude oil can be effectively catalyzed under a medium-temperature condition.

Description

technical field [0001] The invention belongs to the field of oil field exploitation, and in particular relates to an injection method of a heavy oil underground upgrading and viscosity-reducing nanometer catalyst. Background technique [0002] In the process of oil field development of heavy oil / ultra-heavy oil, effective recovery cannot be achieved simply by increasing the viscosity of the displaced phase, and reducing the viscosity of the displaced phase (crude oil) has become an effective technical approach to enhance oil recovery. At present, the existing technologies for achieving effective recovery by reducing the viscosity of the oil phase mainly include three categories: thermal viscosity reduction recovery, physical viscosity reduction recovery with chemical agents, and upgrading and viscosity reduction recovery. [0003] (1) Thermal viscosity reduction production: refers to injecting hot water, steam and other heat sources into the oil reservoir to heat the crude o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 黄佳李阳江航陈希马德胜吴康云张善严魏小芳宋文枫
Owner PETROCHINA CO LTD
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